----------------------------------------------------------------
lines 331-351 of file: include/cppad/example/valvector/class.hpp
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   {xrst_begin valvector_size}

   Size of a valvector
   ###################
   Returns the number or elements in this valvector.

   Prototype
   *********
   {xrst_literal ,
      // BEGIN_SIZE , // END_SIZE
   }

   {xrst_toc_hidden
      example/valvector/size.cpp
   }
   Example
   =======
   The file :ref:`valvector_size.cpp-name` is an example and test of
   valvector size.

   {xrst_end valvector_size}